Here to say that I am having the same problems. Lost connection twice today….
Broadcast HR is absolutely related or can at least exacerbate the problem. I can reproduce the issue easily by having my Whoop 5.0 connect to my Garmin Edge to stream HR, upon completing my activity with Garmin, the Whoop consistently loses connection to my phone. Can reproduce with 2 different Whoop devices and 2 different Garmin devices. Clearly some sort of BT connection bug.
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**** UPDATE 2 ******
I have a partial pattern. Anytime the band is out of touch with the phone or Bluetooth is turned off, it won’t reconnect once it’s within proximity of the phone or Bluetooth is turned back on. The way I get it to reconnect is go to the Bluetooth list, unpair the 5MG and within 15 seconds I get a pop up asking if I would like to reconnect to the device. I HOPE THEY FIX THIS SOON.
I think it maybe when my phone loses connection to the carrier vs phone loses connection to the whoop. I live in the boonies and don’t always have a phone signal. Never had a problem with 4.0
**** UPDATE 3 ****
I woke today to find the 5MG not connected to the phone app and the phone is fully charged at my bedside.
The same fire drill quickly reconnected it (I’ve got this down to second nature at this point): Unpair the 5MG in the phone’s BT device list> Within seconds a WHOOP pair request pops up on the phone> Allow the request> WHOOP app show a green check that the 5MG’s connected again and the app saying “catching up” and battery level’s 60%.
I sure hope they fix this 
This very annoying WHOOP, my 4.0 NEVER had this issue (still doesn’t is what I hear from the friend I gifted it too)… yes I’m looking at you 
@Durkin for help 
@pamelablalock i’d bet good money this is an issue exclusively with the BT connection to your phone. Others in areas with good cellular connections (and/or WiFi connections) appear to be having the same issue plus you should be able to go out and do an activity independent of your phone like going for a run, and the devices reconnect when they’re back in proximity of each other. Finally I have yet to see anyone post that the 4.0 had the same problems prior
"* UPDATE 4 ****
Groundhog’s Day. Happened again last night, and the same process reconnected it
Same!!!
First night with my new 5.0…didn’t detect any activity at all. Struggling to to connect and pair to Bluetooth.
Hi, Whoop 5.0 MG is my first health tracker ever, I was very happy with the purchase for the first couple of days, but Whoop stopped working when I started using Apple CarPlay and different Apple headphones. I know the workaround is to delete the BT connection with the device and then pair it again in the app, but come on guys. Can you imagine using any headphones and having to pair them any time you run Spotify? Im really unsatisfied with how your software/hardware works. Every feature of the device and your software is useless when my Whoop is constantly disconnected and then it takes minutes to reconnect and download all the missing data. This sucks really bad, and I was convinced to buy your gear by a friend… Huge let down, I wanted to use it but soon I’ll be forced to send it back and request my money. Right now it’s a piece of garbage for hundreds of euros.